update win32 script search path

update win32 script search path

The default script search path on Windows is out of date with
the current layout (from installation and documentation), which
makes the standard script library not be found after a normal

	./configure && make && make install

under msys/MinGW. The same should hold true for cygwin native builds
(not verified).

Update search path to ../share/openocd/scripts not ../lib/openocd,
relative to the openocd executable.

Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>